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Java > Open Source Codes > com > izforge > izpack > util > os > RegistryDefaultHandler


1 /*
2  * IzPack - Copyright 2001-2007 Julien Ponge, All Rights Reserved.
3  *
4  * http://www.izforge.com/izpack/
5  * http://developer.berlios.de/projects/izpack/
6  *
7  * Copyright 2005 Klaus Bartz
8  *
9  * Licensed under the Apache License, Version 2.0 (the "License");
10  * you may not use this file except in compliance with the License.
11  * You may obtain a copy of the License at
12  *
13  * http://www.apache.org/licenses/LICENSE-2.0
14  *
15  * Unless required by applicable law or agreed to in writing, software
16  * distributed under the License is distributed on an "AS IS" BASIS,
17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18  * See the License for the specific language governing permissions and
19  * limitations under the License.
20  */

21
22 package com.izforge.izpack.util.os;
23
24 import com.izforge.izpack.util.TargetFactory;
25
26 /**
27  * This class provides on windows a registry handler. All classes which needs registry access should
28  * be use only one handler.
29  *
30  * @author Klaus Bartz
31  *
32  */

33 public class RegistryDefaultHandler
34 {
35
36     private static RegistryHandler registryHandler = null;
37
38     private static boolean initialized = false;
39
40     /**
41      * Default constructor. No instance of this class should be created.
42      */

43     private RegistryDefaultHandler()
44     {
45         super();
46     }
47
48     public synchronized static RegistryHandler getInstance()
49     {
50         if (!initialized)
51         {
52             try
53             {
54                 // Load the system dependant handler.
55
registryHandler = (RegistryHandler) (TargetFactory.getInstance()
56                         .makeObject("com.izforge.izpack.util.os.RegistryHandler"));
57                 // Switch to the default handler to use one for complete logging.
58
registryHandler = registryHandler.getDefaultHandler();
59             }
60             catch (Throwable JavaDoc exception)
61             {
62                 registryHandler = null; //
63
}
64             initialized = true;
65         }
66         if (registryHandler != null && (!registryHandler.good() || !registryHandler.doPerform()))
67             registryHandler = null;
68
69         return (registryHandler);
70     }
71 }
72
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